1 /*
2  * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the Apache License 2.0 (the "License").  You may not use
5  * this file except in compliance with the License.  You can obtain a copy
6  * in the file LICENSE in the source distribution or at
7  * https://www.openssl.org/source/license.html
8  */
9 
10 #include <stdio.h>
11 #include "internal/cryptlib.h"
12 #include "internal/provider.h"
13 #include <openssl/rand.h>
14 #include <openssl/rsa.h>
15 #include <openssl/evp.h>
16 #include <openssl/objects.h>
17 #include <openssl/x509.h>
18 #include <openssl/evp.h>
19 
EVP_SealInit(EVP_CIPHER_CTX * ctx,const EVP_CIPHER * type,unsigned char ** ek,int * ekl,unsigned char * iv,EVP_PKEY ** pubk,int npubk)20 int EVP_SealInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
21                  unsigned char **ek, int *ekl, unsigned char *iv,
22                  EVP_PKEY **pubk, int npubk)
23 {
24     unsigned char key[EVP_MAX_KEY_LENGTH];
25     const OSSL_PROVIDER *prov;
26     OSSL_LIB_CTX *libctx = NULL;
27     EVP_PKEY_CTX *pctx = NULL;
28     const EVP_CIPHER *cipher;
29     int i, len;
30     int rv = 0;
31 
32     if (type != NULL) {
33         EVP_CIPHER_CTX_reset(ctx);
34         if (!EVP_EncryptInit_ex(ctx, type, NULL, NULL, NULL))
35             return 0;
36     }
37     if ((cipher = EVP_CIPHER_CTX_get0_cipher(ctx)) != NULL
38             && (prov = EVP_CIPHER_get0_provider(cipher)) != NULL)
39         libctx = ossl_provider_libctx(prov);
40     if ((npubk <= 0) || !pubk)
41         return 1;
42 
43     if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
44         return 0;
45 
46     len = EVP_CIPHER_CTX_get_iv_length(ctx);
47     if (len < 0 || RAND_priv_bytes_ex(libctx, iv, len, 0) <= 0)
48         goto err;
49 
50     len = EVP_CIPHER_CTX_get_key_length(ctx);
51     if (len < 0)
52         goto err;
53 
54     if (!EVP_EncryptInit_ex(ctx, NULL, NULL, key, iv))
55         goto err;
56 
57     for (i = 0; i < npubk; i++) {
58         size_t keylen = len;
59 
60         pctx = EVP_PKEY_CTX_new_from_pkey(libctx, pubk[i], NULL);
61         if (pctx == NULL) {
62             ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
63             goto err;
64         }
65 
66         if (EVP_PKEY_encrypt_init(pctx) <= 0
67             || EVP_PKEY_encrypt(pctx, ek[i], &keylen, key, keylen) <= 0)
68             goto err;
69         ekl[i] = (int)keylen;
70         EVP_PKEY_CTX_free(pctx);
71     }
72     pctx = NULL;
73     rv = npubk;
74 err:
75     EVP_PKEY_CTX_free(pctx);
76     OPENSSL_cleanse(key, sizeof(key));
77     return rv;
78 }
79 
EVP_SealFinal(EVP_CIPHER_CTX * ctx,unsigned char * out,int * outl)80 int EVP_SealFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
81 {
82     int i;
83     i = EVP_EncryptFinal_ex(ctx, out, outl);
84     if (i)
85         i = EVP_EncryptInit_ex(ctx, NULL, NULL, NULL, NULL);
86     return i;
87 }
88